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Grid of Lyα radiation transfer models for interpreting distant galaxies


Schaerer, D; Hayes, M; Verhamme, A; Teyssier, R (2011). Grid of Lyα radiation transfer models for interpreting distant galaxies. Astronomy & Astrophysics, 531:A12.

Abstract

Context. Lyα is a key diagnostic for numerous observations of distant star-forming galaxies, but detailed radiation transfer models are required for interpreting them.
Aims: We provide an extensive grid of 3D radiation transfer models that simulate the Lyα and UV continuum radiation transfer in the interstellar medium of star-forming galaxies.
Methods: We have improved our Monte Carlo McLya code and used it to compute a grid of 6240 radiation transfer models for homogeneous spherical shells containing Hi and dust surrounding a central source. The simulations cover a wide range of parameter space. We present the detailed predictions from our models including in particular the Lyα escape fraction fesc, the continuum attenuation, and detailed Lyα line profiles.
Results: The Lyα escape fraction is shown to depend strongly on dust content, but also on other parameters (Hi column density and radial velocity). The predicted line profiles show a wide diversity of morphologies, ranging from broad absorption lines to emission lines with complex features. The results from our simulations are distributed in electronic format.
Conclusions: Our models should be of use for interpreting observations from distant galaxies, for other simulations, and should also serve as an important basis for comparison for future, more refined, radiation transfer models.
Full Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A12

Context. Lyα is a key diagnostic for numerous observations of distant star-forming galaxies, but detailed radiation transfer models are required for interpreting them.
Aims: We provide an extensive grid of 3D radiation transfer models that simulate the Lyα and UV continuum radiation transfer in the interstellar medium of star-forming galaxies.
Methods: We have improved our Monte Carlo McLya code and used it to compute a grid of 6240 radiation transfer models for homogeneous spherical shells containing Hi and dust surrounding a central source. The simulations cover a wide range of parameter space. We present the detailed predictions from our models including in particular the Lyα escape fraction fesc, the continuum attenuation, and detailed Lyα line profiles.
Results: The Lyα escape fraction is shown to depend strongly on dust content, but also on other parameters (Hi column density and radial velocity). The predicted line profiles show a wide diversity of morphologies, ranging from broad absorption lines to emission lines with complex features. The results from our simulations are distributed in electronic format.
Conclusions: Our models should be of use for interpreting observations from distant galaxies, for other simulations, and should also serve as an important basis for comparison for future, more refined, radiation transfer models.
Full Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A12

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34 citations in Web of Science®
12 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:July 2011
Deposited On:19 Feb 2012 16:18
Last Modified:05 Apr 2016 15:21
Publisher:EDP Sciences
ISSN:0004-6361 (P) 1432-0746 (E)
Publisher DOI:10.1051/0004-6361/201116709
Related URLs:http://arxiv.org/abs/1104.5383
Permanent URL: http://doi.org/10.5167/uzh-54765

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